Test indicator

• US 4,142,295 A
• Filed: 11/30/1977
• Issued: 03/06/1979
• Est. Priority Date: 12/28/1976
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Mitutoyo Seisakusho
• Original Assignee: Kabushiki Kaisha Mitutoyo Seisakusho
• Inventors: Nishina, Shingo, Nakaoki, Tokuzo
• Primary Examiner(s): Stearns, Richard R.
• Application Number:
  US05/856,107
• Time in Patent Office: 461 Days
• Field of Search: 33/169 R, 33/169 C, 33/172 B, 33/172 E, 33/172 D
• US Class Current: 33/559
• CPC Class Codes: G01B 3/22 Feeler-pin gauges, e.g. dial gauges for measuring contours or curvatures G01B5/20

Abstract

A test indicator comprising a holder to which is pivoted a measuring arm with a measuring tip; a casing equipped with a means for magnifying the displacement of said measuring tip; and an intermediate shaft which moves axially in response to pivoted displacement of the measuring tip, thereby transmitting pivotal displacement of the tip to the magnifying means, the holder being fitted to the casing for 360° rotation around the intermediate shaft so that the plane of pivotal movement of the measuring tip can be changed.

Claims

1. A test indicator comprising, a measuring arm, a cam connected to the measuring arm and pivoted to an end of a holder, a measuring tip secured to the end of said measuring arm;

an intermediate shaft mounted in said holder for axial displacement;

cooperating means on said cam and said intermediate shaft for displacing said shaft axially in response to pivotal movement of the measuring arm and comprising a contact surface on said said shaft and facing toward said cam, and a pair of spherically curved contact members on said cam and engaging the contact surface of the shaft, said contact members being on opposite sides of and spaced the same distance from the axis of said shaft;

a casing;

means in said casing for magnifying the displacement of said intermediate shaft;

means for mounting said holder on said casing for rotational adjustment of said holder with respect to the casing about the axis of said shaft and wherein said holder has a plurality of recesses circumferentially spaced apart at specific angles around its body;

a ball engagable in said recesses is held in the casing;

said ball is urged toward said body by a spring, and a screw threaded into the casing provides for adjusting the force of said spring.

2. The test indicator of claim 1, wherein said means mounting said holder for rotation comprises a cylindrical body of the holder rotatably fitted in a hole of the casing, an annular groove formed circumferentially around the holder, and a tip of a screw fitted in the body and extending into said annular groove.

3. The test indicator of claim 2, wherein a reference line is provided on one of the casing and the holder;

and an angular scale is provided on the other of the holder and the casing.